Income tax would have been withheld if the employee had claimed no more than one withholding allowance or had not claimed exemption from withholding on Form W-4, Employee's Withholding Allowance Certificate.

Also, every employer engaged in a trade or business who pays remuneration for services performed by an employee, including noncash payments, must file a Form W-2 for each employee even if the employee is related to the employer.